noun (n)

• a barrier that surrounds the wheels of a vehicle to block splashing water or mud(noun.artifact)

  Example:
  In Britain they call a fender a wing.
  

  Synonym:
  wing
  

  source: wordnet30
• an inclined metal frame at the front of a locomotive to clear the track(noun.artifact)

  Synonym:
  buffer, cowcatcher, pilot
  

  source: wordnet30
• a low metal guard to confine falling coals to a hearth(noun.artifact)

  source: wordnet30
• a cushion-like device that reduces shock due to an impact(noun.artifact)

  Synonym:
  buffer
  

  source: wordnet30
• One who or that which defends or protects by warding off harm(noun)

  source: webster1913